[entity] Entity.related(): add a targettypes argument (closes #2957313) This allows to restrict the entity types returned by the method (passed to cw_related_rql). When such an argument is given, no caching happens.

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−# -*- coding: utf-8 -*-
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−# copyright %(year)s %(author)s, all rights reserved.
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−# contact %(author-web-site)s -- mailto:%(author-email)s
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−#
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−%(long-license)s
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−"""%(distname)s specific hooks and operations"""